Thermo Scientific PARTISOL 2000 Service Manual page 15

Display blank or
incomplete
Power system
off then on.
Blank or Hit several keys
Blank
incomplete? on the keypad.
Incomplete
Check continuity of cable
P16A (interface board) to
A
P1 (display) (see note 1
on sheet B).
Replace cable
Continuity OK? No
R&P P/N 51-005637
Yes
Install a working
display and recheck.
R&P P/N 10-002254
Display now Original display was
Yes
work?
defective.
No
Replace interface/CPU
board assembly
R&P P/N 50-005496
& 10-002407
DISPLAY TROUBLESHOOTING FLOW CHART-A
Display contrast
may need
Is backlight on? Yes
adjustment.
No
Did pump run
at all when power was
Yes Go to B
turned on?
No
Is the electronics electronics
compartment fan Yes compartment
running? temperature
> 65°C?
No
Replace interface/CPU
Ensure the proper
board assembly
voltage is present at
R&P P/N 50-005496
the AC outlet.
& 10-002407
Check the continuity of all the
AC components between the
AC voltage OK? Yes
power cord and P2 on the
interface board.
No
Correct problem.
Resume normal
operation.
Yes
Adjust contrast with
Able to adjust
knob on front of
contrast?
display.
Replace assembly
R&P P/N 51-005668
Is
Place hand near (do NOT
touch!) the heater at the
Yes
top of the electronics
compartment.
No
Heat coming
Yes
from heater?
Components
OK?
No
Replace defective
component.
Check continuity of
No contrast adjustment
pot assembly.
No Continuity OK?
Yes
Perform system
reset.
Still Blank
Go to A
Wait for instrument to
No
cool down.
Replace interface/CPU
board assembly
Yes
R&P P/N 50-005496
& 10-002407